This extension draws constructions about a triangle defined by the first 3 nodes of a selected path. You may select one of preset objects or create your own ones.
All units are the Inkscape's pixel unit. Angles are all in radians.
You can specify a point by trilinear coordinates or by a triangle centre function.
Enter as functions of the side length or angles.
Trilinear elements should be separated by a colon: ':'.
Side lengths are represented as 's_a', 's_b' and 's_c'.
Angles corresponding to these are 'a_a', 'a_b', and 'a_c'.
You can also use the semi-perimeter and area of the triangle as constants. Write 'area' or 'semiperim' for these.
You can use any standard Python math function:
ceil(x); fabs(x); floor(x); fmod(x,y); frexp(x); ldexp(x,i);
modf(x); exp(x); log(x [, base]); log10(x); pow(x,y); sqrt(x);
acos(x); asin(x); atan(x); atan2(y,x); hypot(x,y);
cos(x); sin(x); tan(x); degrees(x); radians(x);
cosh(x); sinh(x); tanh(x)
Also available are the inverse trigonometric functions:
sec(x); csc(x); cot(x)
You can specify the radius of a circle around a custom point using a formula, which may also contain the side lengths, angles, etc. You can also plot the isogonal and isotomic conjugate of the point. Be aware that this may cause a divide-by-zero error for certain points.

represents a line break.
Start a new line in the equivalent position in the translation.

represents a space character.
Enter a space in the equivalent position in the translation.